1. Test Monday: Practice 6, Review sheet due!!!
U1D11: Graphing
Giving Science Predictive Powers
Do Now: 1. Check Practice #5
2. Vocab out for collection
3. . Rounding (2)and Sci Notation checks
Agenda:
Conversion Review WS review
Graphing: A picture is worth a thousand words!
Practice…..
Test Monday: Practice 6, Review sheet due!!!

2. What Do You Know?
Explain, in complete sentences, how to convert 45.0 cm to km using a conversion factor, ending with the correctly converted measurement.

3. The Scientific Method USED TO: Graphing does the following:
To EXPLAIN observed phenomena
To PREDICT outcomes
Graphing does the following:
Illustrates the relationships between tested variables
Provides a basis for determining mathematical relationships between variables
Allows a researcher to make testable predictions

4. How To Build A Graph Axes, labeled as follows:
Number range, leaving room to EXTRAPOLATE with values at regular intervals. (numbers given for example purposes, only)
Dependent Variable (Unit)
Independent Variable (Unit)

5. How To Build A Graph 3) Title, as demonstrated:
Dependent Variable vs. Independent Variable
Dependent Variable (Unit)
Independent Variable (Unit)

6. How To Build A Graph
InDep. Var. (unit)
Dep. Var. (unit) 2 10 4 20 7 30 9 40 12
4) Data Points (based on data table): 5) Draw Point Protectors 6) Draw Line of Best Fit
Dependent Variable vs. Independent Variable
Dependent Variable (Unit)
Independent Variable (Unit)

7. Line of Best Fit (linear graphs)
Best represents the slope of the line that the data makes. Make sure that the total distance of the points above and below the line are about the same.
Dependent Variable vs. Independent Variable
Too High
Too Steep
Just Right!
Dependent Variable (Unit)
Too Shallow
Independent Variable (Unit)

8. Respect the y-intercept!
In y = mx + b, b is where the line crosses the y axis. It’s not always zero so do not drop from your first data point to zero.
Dependent Variable vs. Independent Variable
Dependent Variable (Unit)
Excellent line of best fit!!!!
COMPLETELY
UNJUSTIFIED!!
Independent Variable (Unit)

9. Size of Graph
A graph should take up a MINIMUM of ½ of the page it it drawn on. The bigger the graph, the more easily it is read.
Independent Variable (Unit)
Dependent Variable (Unit)
Dependent Variable vs. Independent Variable

10. Direct Relationship
As one variable increases, the other variable increases as well.
It does not have to be at the same rate (m, the slope, determines the rate)
Distance vs. Time
Distance (cm)
Time (sec)

11. Inverse Relationship
As one variable increases, the other variable decreases.
Distance vs. Time
Volume (mL)
Pressure (atm)

12. Interpolation 7 cm Making predictions WITHIN your data set
How many cm will be traveled in 26 seconds?
Time (sec)
Distance (cm)
Distance vs. Time
7 cm

13. Extrapolation 15 cm Making predictions BEYOND your data set
How many cm will be traveled in 53 seconds?
Graphs are read like measuring devices.
Time (sec)
Distance (cm)
Distance vs. Time
15 cm

14. Now it’s YOUR TURN!!!! (p. 27)
Based on the reading, determine which variable is which
Using the data table, create a proper graph that takes up a minimum of ½ of the graph paper. Leave room for extrapolation.
Make the predictions and determine whether you used INTER or EXTRApolation.

15. Now it’s YOUR TURN!!!! (p. 28)
Take out your Reference Tables and look up Ref. Table H.
Read the information on how to use Table H.
Make predictions based on Table H. Remember that you can only read the graph one place smaller than it’s marked to. Include units in your answer.

16. Ticket Out
Explain in complete sentences how to determine the number of people in the store at 2:30 PM, ending with the correct answer.